/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef SRC_SQL_ENGINE_EXPR_OB_EXPR_QUOTE_H_
#define SRC_SQL_ENGINE_EXPR_OB_EXPR_QUOTE_H_
#include "sql/engine/expr/ob_expr_operator.h"

namespace oceanbase {
namespace sql {
class ObExprQuote : public ObStringExprOperator {
  public:
  ObExprQuote();
  explicit ObExprQuote(common::ObIAllocator& alloc);
  virtual ~ObExprQuote();
  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
  virtual int calc_result1(common::ObObj& result, const common::ObObj& obj, common::ObExprCtx& expr_ctx) const;
  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
  static int calc_quote_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum);

  private:
  static const int16_t APPEND_LEN = 2;
  static const int16_t LEN_OF_NULL = 4;
  // quote string
  static int calc(common::ObString& res_str, common::ObString str, common::ObCollationType coll_type,
      common::ObIAllocator* allocator);
  static int string_write_buf(const common::ObString& str, char* buf, const int64_t buf_len, int64_t& pos);
  DISALLOW_COPY_AND_ASSIGN(ObExprQuote);
};
}  // namespace sql
}  // namespace oceanbase

#endif /* SRC_SQL_ENGINE_EXPR_OB_EXPR_QUOTE_H_ */
